When people say they are going to the 'hole in the wall', they usually mean they are off to get some money from the ATM. But in this case it's the name of a city centre pub, on North Sherwood Street.
I've no idea why the pub is called what it is, as it's nowhere near any holes!
Today marks my 500th entry, so I'm inviting everyone in the blogging community over for a virtual drink on me.